Burglar-alarm.



UNITED OFFICE.

BUBGLARQALARM.

Application filed Se tember 11-, 1915. Seri a1i1'o.50,277.

To all whomjt may concern:

Be it known that I, ERNEST W. SLICK, acitizen of the United States, residing at Gary, in the countyof Lake and State of Indiana, have invented new and useful Improvements --in Burglar-Alarms, of which the following is a-specification.

This invention relates to certain .novel and useful improvements in burglar alarms. In carrying "out the present invention it La. -uy purpose to provide a burglar alarm which may .1m f readily and quicklyapplied to a doo adjacent to the "keyhole thereof so that 111 the event of any one inserting a key into the-lock the alarm will be operated to advise the occupants of the protected structure of the attempted entry and which may be applied to windows so that should any one attempt to forcesuch window the alarm will be sounded. I

the invention consists in the construction; combination and arrangement of parts here- 4 inafter set forth in and falling within the scope of the claims.

In the accompanying drawings, Figure 1 is a. view in side' elevation of .my improved alarm apparatus thesame being shown; as applied to a door. Fig. 2 is a view showing my invention applied to a window. Fig. 3 is an end view of the device. Referring now to the drawing in deta l 1 .wignate a strip of wood or other material while 2 indicates a length of wire co led upon itself between its ends to form a sprang 3 and having one of the legs thereof coiled about the strip 1 as at 4 and'then pro ected upwardly as at 5 and formed to provide a loop 6, and the other 1e lying parallel with the upper edge of t e strip 1 and formed centrally to provide an impact member 7. The end of the leg of the spring formed with the member 7 remote from the spring 3 terminates adjacent to one end of the strip 1, while the spring 1s arranged at the other end of the .strip. Mounted within the loop 6 and suitably fastened therein is a cork 8 or other holder and formed in the lower side of the cork 8 is a recess QB-adapted to receive the impact member 7 Also formed in the lower end of the cork contiguous to the inner end of the recess 9 is an opening 10 designed to hold the powder cap or other detonatlng element. I

When applying the device to a door one Specification of Letters Patent. Patented J 119 2'7,-

' with said member.

I end of the strip of wood andthe adjacent end ofthe leg of the spring-- formed with the impactmember 7 are arranged in the keyhole as illustrated in Fig. '1, and the end of-said leg of the spring engaged with the upper wall ofthe key hole to hold the leg under tension and against movement under the action of the spring 3. 'When a key is inserted in thekey hole such key forces the particular end of the leg of the wire out of} the key hole and as soon' as su'ch' .-leg isjre r lieved of the influenceiof thelwall of the hole the spring'3 r'e-acts and throws said g leg upWar ly thereby forcing the member 7 through the recess 9 and into engagement with the powder cap 11 with the effect to explode'such cap. Thus the occupants of the protected structure are advised of the attempted entry.

LIWhen applying the device to a window, With the above and other objects in view cleats 12-12 are employed and fastened'to the meeting rails of the respective sash frames of the window,- and the ends of the strip 1 and the leg of the wire lying parallel with the strip engaged with the respective cleats so that in the event of attempt being made to force thewindow open the leg of the wire will be released and the cap detonated as previously described.

While'I have herein shown and described one particular form of my invention I wish it to be understood that I do not limit or confine'myself'to the precise details of construction herein described and delineated as modifications and variations maybe made within the scope of the claims and without departing from the spirit of the invention.

I claim i i 1. A device of the class described com-,

prising a securing strip, a length of wire coiled upon itself between its ends to forma spring and having one leg wrapped about said strip and then projected upwardly and the remaining legadapted to be held in proximity to the strip and formed to provide an impact member and a detonating element carried by the upper end'of the upwardly proiecting portion of the first mentioned leg of said wire and disposed in the path of movement of said impact member,

whereby said elementmay be exploded in the upward movement of 2, A device. ofthe $313.85 00F].- prising a securing strip, a length of wire coiled upon itself between its ends to form the leg formed a spring and having one leg Wrapped about said strip and then projected upwardly andthe remaining leg adapted to be held in proximity to the strip and formed to provide an impact member and the upper end of the upwardly'projecting portion of the first mentioned leg of said wire being formed to provide a loop, a holder within said loop and a detonating element carried by'said holder and d] osed in the path of movement of said impact member whereby said detonating element will be exploded in the upward movement of the leg formed with said member.

In testimony whereof I afllx my signature 15 

